<?php namespace CodeIgniter\Database\SQLite3;

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014-2017 British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	CodeIgniter Dev Team
 * @copyright	2014-2017 British Columbia Institute of Technology (https://bcit.ca/)
 * @license	https://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 3.0.0
 * @filesource
 */
use CodeIgniter\Database\BaseResult;
use CodeIgniter\Database\ResultInterface;

/**
 * Result for SQLite3
 */
class Result extends BaseResult implements ResultInterface
{

    /**
     * Gets the number of fields in the result set.
     *
     * @return int
     */
    public function getFieldCount(): int
    {
        return $this->resultID->numColumns();
    }

    //--------------------------------------------------------------------

    /**
     * Generates an array of column names in the result set.
     *
     * @return array
     */
    public function getFieldNames(): array
    {
        $fieldNames = [];
        for ($i = 0, $c = $this->getFieldCount(); $i < $c; $i ++ )
        {
            $fieldNames[] = $this->resultID->columnName($i);
        }

        return $fieldNames;
    }

    //--------------------------------------------------------------------

    /**
     * Generates an array of objects representing field meta-data.
     *
     * @return array
     */
    public function getFieldData(): array
    {
        static $data_types = [
            SQLITE3_INTEGER	=> 'integer',
            SQLITE3_FLOAT	=> 'float',
            SQLITE3_TEXT	=> 'text',
            SQLITE3_BLOB	=> 'blob',
            SQLITE3_NULL	=> 'null'
        ];

        $retval = [];

        for ($i = 0, $c = $this->getFieldCount(); $i < $c; $i ++ )
        {
            $retval[$i] = new \stdClass();
            $retval[$i]->name = $this->resultID->columnName($i);
            $type = $this->resultID->columnType($i);
            $retval[$i]->type = isset($data_types[$type]) ? $data_types[$type] : $type;
            $retval[$i]->max_length = NULL;
        }

        return $retval;
    }

    //--------------------------------------------------------------------

    /**
     * Frees the current result.
     *
     * @return mixed
     */
    public function freeResult()
    {
        if (is_object($this->resultID))
        {
            $this->resultID->finalize();
            $this->resultID = false;
        }
    }

    //--------------------------------------------------------------------

    /**
     * Moves the internal pointer to the desired offset. This is called
     * internally before fetching results to make sure the result set
     * starts at zero.
     *
     * @param int $n
     *
     * @return mixed
     * @throws \CodeIgniter\DatabaseException
     */
    public function dataSeek($n = 0)
    {
        if ($n != 0)
        {
            if ($this->db->DBDebug) {
                throw new DatabaseException('SQLite3 doesn\'t support seeking to other offset.');
            }
            return false;
        }
        return $this->resultID->reset();
    }

    //--------------------------------------------------------------------

    /**
     * Returns the result set as an array.
     *
     * Overridden by driver classes.
     *
     * @return array
     */
    protected function fetchAssoc()
    {
        return $this->resultID->fetchArray(SQLITE3_ASSOC);
    }

    //--------------------------------------------------------------------

    /**
     * Returns the result set as an object.
     *
     * Overridden by child classes.
     *
     * @param string $className
     *
     * @return object
     */
    protected function fetchObject($className = 'stdClass')
    {
        // No native support for fetching rows as objects
        if (($row = $this->fetchAssoc()) === FALSE)
        {
            return FALSE;
        }
        elseif ($className === 'stdClass')
        {
            return (object) $row;
        }

        $classObj = new $className();
        $classSet = \Closure::bind(function ($key, $value) {
            $this->$key = $value;
        }, $classObj, $className
        );
        foreach (array_keys($row) as $key)
        {
            $classSet($key, $row[$key]);
        }
        return $classObj;
    }

    //--------------------------------------------------------------------
}
